Hayen, R. L. (1994). Software tools for business: An information systems approach. Wiley.
Lua i Stíl Chicago (17ú heag.)Hayen, Roger L. Software Tools for Business: An Information Systems Approach. New York: Wiley, 1994.
Lua MLA (8ú heag.)Hayen, Roger L. Software Tools for Business: An Information Systems Approach. Wiley, 1994.
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